Question

Sl no Item No Power Time Units
1 Light 4 40W 8h 1.28
2. Fan 2 50W 16h 1.6
3. Television 1 100W 4h 0.4
4. Refrigerator 1 400W 12h 4.8
What is the cost of electrical energy consumed at Rs 5 per
unit in the above case?

Answer 1

Answer:

Power of one tube light=40W

Power of 4 tube lights=4×40=160W=0.16kW

Energy consumed by 4 tube lights each day =0.16×5=0.8kWh

Power of one fan =120W

Power of 3 fans =3×120=360W=0.36kW

Energy consumed by 3 fans each day =0.36×4=1.44kWh

Total electrical energy consumed per day =0.8+1.44=2.24kWh

∴total number of units consumed per day =2.24units

Cost of one unit=5

Number of days in the month of September=30 days

∴ Electricity bill for the month of September=2.24×30×5=336